[Tkinter] [split] Is there a way to embed a treeview as a row inside another treeview?

[CyKlop]

I am not used to seeing column headings for hierarchical information. I think that would be confusing.

The problem is, of course, that it is displaying a list, each item of which is ALSO a list, and the two lists are heterogenous (radically different shapes). Do you have a better idea how to display this? Although I've done some Python coding, I'm a neophyte at Tk. Perhaps there's a better widget for this?